Energy
Energy is need to make things happen. We use energy to:
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Provide heating and lighting for our homes, schools, etc.
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Make things work (e.g. cars, buses, trains)
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Keep our bodies working.
Some forms of energy can be stored so that they are ready for when we need it. These are shown in the diagram below:
Stored (Potential) Energies
Other forms of energy can be thought of as 'Energies in action'. These are summarised below:
Energies in Action
Energy Transfers
Energy cannot be made or destroyed but can only be changed from one form to another. Whenever you use an electronic device electrical energy is changed into other forms of energy. In the example below, Chemical Energy in the battery is changed into electrical energy which is then changed into sound energy.
Chemical
Energy 
Electrical
Energy Sound
Energy